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Segment Information (Reconciliation of Segment General and Administration to Consolidated) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Segment general and administrative expenses $ 258.1 $ 221.3 $ 242.8
General and administration 531.1 475.4 486.6
Operating segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Segment general and administrative expenses 258.1 221.3 242.8
Corporate      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Corporate general and administrative expenses 122.9 97.1 113.7
Corporate and reconciling items      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Purchase accounting and related adjustments 195.5 194.0 192.4
General and administrative expense      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Purchase accounting and related adjustments 54.7 58.7  
General and administrative expense | Corporate and reconciling items      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Share-based compensation expense included in general and administrative expense 95.4 98.3 82.9
Purchase accounting and related adjustments $ 54.7 $ 58.7 $ 47.2